R help - Jan 2009 - plotting lines with missing data for x values

I have some data (REE plots - geochemistry) where I have values 1:14 for the
x axis, but have no data for some x values.  Here for example, let's say
that I don't have data for x=2,5,8.

So

x<-1:14
y<-c(4, NA, 5, 9, NA, 3.4, 8, NA, 19, 22, 12, 14, 15.3, 15)

if I plot the data

plot(x,y)

and then I want to join with lines

lines(x,y)

How do I get it so the points join across the missing x-values?  So the line
joins, for example, point 1,4 with point 3,5  (i.e across point 2,NA)?

Thanks in advance.


Gareth Campbell
PhD Candidate
The University of Auckland

P    +649 815 3670
M    +6421 256 3511
E   gareth.campbell@esr.cri.nz
    gcam032@gmail.com

	[[alternative HTML version deleted]]

Gareth Campbell wrote:
> I have some data (REE plots - geochemistry) where I have values 1:14 for
the
> x axis, but have no data for some x values.  Here for example, let's
say
> that I don't have data for x=2,5,8.
>
> So
>
> x<-1:14
> y<-c(4, NA, 5, 9, NA, 3.4, 8, NA, 19, 22, 12, 14, 15.3, 15)
>
> if I plot the data
>
> plot(x,y)
>
> and then I want to join with lines
>
> lines(x,y)
>
> How do I get it so the points join across the missing x-values?  So the
line
> joins, for example, point 1,4 with point 3,5  (i.e across point 2,NA)?
>   
By convention, NA's say to break the lines, so remove the NA's. 

okay <- !is.na(x) & !is.na(y)
lines(x[okay], y[okay])

Duncan Murdoch
> Thanks in advance.
>
>
> Gareth Campbell
> PhD Candidate
> The University of Auckland
>
> P    +649 815 3670
> M    +6421 256 3511
> E   gareth.campbell at esr.cri.nz
>     gcam032 at gmail.com
>
> 	[[alternative HTML version deleted]]
>
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